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NetworkX DiGraph construction from extracted entities + trials.
Upserts nodes and edges (merges PMIDs, recomputes confidence average).
Pre-populates with ALS seed entities from config.
"""
from __future__ import annotations
import json
from pathlib import Path
import networkx as nx
from config import (
ALS_SEED_ENTITIES,
ENTITIES_PATH,
KG_MIN_EDGE_CONFIDENCE,
TRIALS_PATH,
)
from extraction.normalizer import normalize_entity
from logging_config import get_logger
from models import PaperExtractionResult
_logger = get_logger("graph.builder")
def build_graph(
entities_path: Path = ENTITIES_PATH,
trials_path: Path = TRIALS_PATH,
) -> nx.DiGraph:
"""Build the ALS knowledge graph. Returns a populated DiGraph."""
G: nx.DiGraph = nx.DiGraph()
_add_seed_entities(G)
_logger.info(f"Seeded graph: {G.number_of_nodes()} seed nodes")
if entities_path.exists():
n_papers = _add_extracted_entities(G, entities_path)
_logger.info(
f"After extraction: {G.number_of_nodes()} nodes, "
f"{G.number_of_edges()} edges from {n_papers} papers"
)
else:
_logger.warning(f"Entities file not found: {entities_path} — skipping NER enrichment")
if trials_path.exists():
n_trials = _add_trials(G, trials_path)
_logger.info(f"Added {n_trials} trial nodes")
else:
_logger.warning(f"Trials file not found: {trials_path}")
return G
def _add_seed_entities(G: nx.DiGraph) -> None:
type_map = {
"genes": "Gene",
"proteins": "Protein",
"compounds": "Compound",
"mechanisms": "Mechanism",
"phenotypes": "Phenotype",
}
for category, entity_type in type_map.items():
for name in ALS_SEED_ENTITIES.get(category, []):
canonical_id = normalize_entity(name, entity_type)
_upsert_node(G, canonical_id, {
"type": entity_type,
"display_name": name,
"paper_count": 0,
"evidence_pmids": [],
"is_seed": True,
})
def _add_extracted_entities(G: nx.DiGraph, entities_path: Path) -> int:
n_papers = 0
with open(entities_path, encoding="utf-8") as f:
for line in f:
line = line.strip()
if not line:
continue
raw = json.loads(line)
pmid = raw["pmid"]
n_papers += 1
# Add / update entity nodes
for ent in raw.get("entities", []):
canonical_id = ent.get("canonical_id", "")
if not canonical_id:
continue
if G.has_node(canonical_id):
G.nodes[canonical_id]["paper_count"] += 1
G.nodes[canonical_id]["evidence_pmids"].append(pmid)
# Update confidence as running average
cur = G.nodes[canonical_id].get("confidence", 0.7)
G.nodes[canonical_id]["confidence"] = (cur + ent.get("confidence", 0.7)) / 2
else:
_upsert_node(G, canonical_id, {
"type": ent.get("type", "Unknown"),
"display_name": ent.get("name", canonical_id),
"paper_count": 1,
"evidence_pmids": [pmid],
"confidence": ent.get("confidence", 0.7),
"is_seed": False,
})
# Add / update relationship edges
for rel in raw.get("relationships", []):
source = rel.get("source", "")
target = rel.get("target", "")
rel_type = rel.get("relation_type", "")
if not source or not target or not rel_type:
continue
# Ensure both endpoints exist as nodes
for node_id in (source, target):
if not G.has_node(node_id):
_upsert_node(G, node_id, {
"type": "Unknown",
"display_name": node_id.split(":", 1)[-1],
"paper_count": 0,
"evidence_pmids": [],
"is_seed": False,
})
conf = rel.get("confidence", 0.7)
if G.has_edge(source, target):
edge = G[source][target]
if rel_type not in edge.get("relation_types", []):
edge.setdefault("relation_types", [edge.get("relation_type", rel_type)])
edge["relation_types"].append(rel_type)
if pmid not in edge["evidence_pmids"]:
edge["evidence_pmids"].append(pmid)
# Running average confidence
edge["confidence"] = (edge["confidence"] + conf) / 2
else:
G.add_edge(source, target, **{
"relation_type": rel_type,
"relation_types": [rel_type],
"evidence_pmids": [pmid],
"confidence": conf,
"evidence_text": rel.get("evidence_text", ""),
})
return n_papers
def _add_trials(G: nx.DiGraph, trials_path: Path) -> int:
n_trials = 0
with open(trials_path, encoding="utf-8") as f:
for line in f:
line = line.strip()
if not line:
continue
trial = json.loads(line)
nct_id = trial.get("nct_id", "")
if not nct_id:
continue
node_id = f"trial:{nct_id}"
_upsert_node(G, node_id, {
"type": "ClinicalTrial",
"display_name": trial.get("title", nct_id)[:120],
"nct_id": nct_id,
"phase": trial.get("phase", ""),
"status": trial.get("status", ""),
"url": trial.get("url", f"https://clinicaltrials.gov/study/{nct_id}"),
"paper_count": 0,
"evidence_pmids": [],
})
# Link trial to known target entities
for target_name in trial.get("target_entities", []):
# Try gene, compound, protein
matched = False
for etype in ("Gene", "Compound", "Protein", "Mechanism"):
candidate_id = normalize_entity(target_name, etype)
if G.has_node(candidate_id):
if not G.has_edge(node_id, candidate_id):
G.add_edge(node_id, candidate_id, **{
"relation_type": "TESTED_IN",
"relation_types": ["TESTED_IN"],
"evidence_pmids": [],
"confidence": 1.0,
"evidence_text": "",
})
matched = True
break
if not matched:
_logger.debug(f"Trial {nct_id}: no graph node for target {target_name!r}")
n_trials += 1
return n_trials
def _upsert_node(G: nx.DiGraph, node_id: str, attrs: dict) -> None:
if G.has_node(node_id):
G.nodes[node_id].update(attrs)
else:
G.add_node(node_id, **attrs)
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